/*
**  Copyright (c) 2001-2002 The OSSP Project <http://www.ossp.org/>
**  Copyright (c) 2001-2002 Cable & Wireless Deutschland <http://www.cw.com/de/>
**
**  This file is part of OSSP lmtp2nntp, an LMTP speaking local
**  mailer which forwards mails as Usenet news articles via NNTP.
**  It can be found at http://www.ossp.org/pkg/lmtp2nntp/.
**
**  This program is free software; you can redistribute it and/or
**  modify it under the terms of the GNU General Public  License
**  as published by the Free Software Foundation; either version
**  2.0 of the License, or (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**  General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this file; if not, write to the Free Software
**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
**  USA, or contact the OSSP project <ossp@ossp.org>.
**
**  lmtp2nntp_config.c: config handling
*/

#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>

/* third party (included) */
#include "lmtp2nntp_argz.h"

/* third party (linked in) */
#include "str.h"
#include "val.h"
#include "popt.h"
#include "l2.h"

/* library version check (compile-time) */
#define STR_VERSION_HEX_REQ 0x009206
#define STR_VERSION_STR_REQ "0.9.6"
#ifdef STR_VERSION_HEX
#if STR_VERSION_HEX < STR_VERSION_HEX_REQ
#error "require a newer version of OSSP Str"
#endif
#endif

/* own headers */
#include "lmtp2nntp_global.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(HAVE_DMALLOC_H) && defined(DMALLOC)
#include "dmalloc.h"
#endif
#include "lmtp2nntp_option.h"
#include "lmtp2nntp_config.h"
#include "lmtp2nntp_lmtp.h"
#include "lmtp2nntp_nntp.h"
#include "lmtp2nntp_msg.h"
#include "fixme.h"
#define _LMTP2NNTP_VERSION_C_AS_HEADER_
#include "lmtp2nntp_version.c"
#undef  _LMTP2NNTP_VERSION_C_AS_HEADER_

#ifndef FALSE
#define FALSE (1 != 1)
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif

#ifndef NUL
#define NUL '\0'
#endif

static l2_result_t 
formatter_prefix(l2_context_t *_ctx, const char id, const char *param,
          char *bufptr, size_t bufsize, size_t *buflen, va_list *ap)
{
    lmtp2nntp_t *ctx = (lmtp2nntp_t *)_ctx->vp;
            
    if ((ctx->msg != NULL) && (ctx->msg->cpFid != NULL)) {
        sprintf(bufptr, "%s: ", ctx->msg->cpFid);
        *buflen = strlen(bufptr);
    }
    else
        *buflen = 0;
    return L2_OK;
}

static l2_result_t 
formatter_errno(l2_context_t *_ctx, const char id, const char *param,
          char *bufptr, size_t bufsize, size_t *buflen, va_list *ap)
{
    sprintf(bufptr, "(%d) %s", errno, strerror(errno));
    *buflen = strlen(bufptr);
    return L2_OK;
}

void config_context(lmtp2nntp_t *ctx)
{
    ex_t ex;
    optionval_t *ov;
    //char *cp;
    int rc;

    /* create L2 environment */
    if (l2_env_create(&ctx->l2_env) != L2_OK) {
        fprintf(stderr, "%s:Error: failed to create L2 environment\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (l2_env_formatter(ctx->l2_env, 'P', formatter_prefix, &ctx->ctx) != L2_OK) {
        fprintf(stderr, "%s:Error: logging failed to register prefix formatter\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (l2_env_formatter(ctx->l2_env, 'D', l2_util_fmt_dump, NULL) != L2_OK) {
        fprintf(stderr, "%s:Error: logging failed to register dump formatter\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (l2_env_formatter(ctx->l2_env, 'S', l2_util_fmt_string, NULL) != L2_OK) {
        fprintf(stderr, "%s:Error: logging failed to register string formatter\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (l2_env_formatter(ctx->l2_env, 'm', formatter_errno, NULL) != L2_OK) {
        fprintf(stderr, "%s:Error: logging failed to register errno formatter\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (val_get(ctx->val, "option.l2spec", &ov) != VAL_OK) {
        fprintf(stderr, "%s:Error: (internal) config did not register 'l2spec' option\n", ctx->progname);
        CU(ERR_EXECUTION);
    }
    if (ov->data.s != NULL) {
        if ((rc = l2_spec(&ctx->l2, ctx->l2_env, ov->data.s)) != L2_OK) {
            fprintf(stderr, "%s:Error: logging failed to create stream\n", ctx->progname);
            CU(ERR_EXECUTION);
        }
        if (l2_channel_levels(ctx->l2, L2_LEVEL_ALL, L2_LEVEL_NONE) != L2_OK) { /* FIXME should this globalmask and flushmask be user-configurable? */
            fprintf(stderr, "%s:Error: logging failed to set global logging level\n", ctx->progname);
            CU(ERR_EXECUTION);
        }
        if (l2_channel_open(ctx->l2) != L2_OK) {
            fprintf(stderr, "%s:Error: logging failed to open channel stream\n", ctx->progname);
            CU(ERR_EXECUTION);
        }
    }
    /* from this point on logging is up and running and fprintf(stderr, ...)
     * should not be used in the remainder of the program flow.
     */
    log1(ctx, NOTICE, "startup, version %s", lmtp2nntp_version.v_gnu);

    /* --childsmax SINGLE */
    try {
        if (   (val_get(ctx->val, "option.childsmax", &ov) != VAL_OK)
            || (ov->ndata != 1)
            || (ov->data.s == NULL)
              ) throw(0,0,0);
        log1(ctx, TRACE, "--childsmax = \"%s\"", ov->data.s);

        if ((ctx->option_childsmax = atoi(ov->data.s)) <= 0) {
            log1(ctx, ERROR, "option --childsmax, number (%d) out of range",
                 ctx->option_childsmax);
            throw(0,0,0);
        }
    }
    catch (ex) {
        rethrow;
    }

    /* --daemonize FLAG */
    try {
        if (   (val_get(ctx->val, "option.daemonize", &ov) != VAL_OK)
            || (ov->ndata != 1)
            || (ov->data.f != 1)
              ) throw(0,0,0);
        log1(ctx, TRACE, "--daemonize = %d", ov->data.f);

        ctx->option_daemon = TRUE;
    }
    catch (ex)
        rethrow;

    /* --kill FLAG */
    try {
        if (   (val_get(ctx->val, "option.kill", &ov) != VAL_OK)
            || (ov->ndata != 1)
            || (ov->data.f != 1)
              ) throw(0,0,0);
        log1(ctx, TRACE, "--kill = %d", ov->data.f);

        ctx->option_killflag = TRUE;
    }
    catch (ex)
        rethrow;

    /* --pidfile SINGLE */
    try {
        if (   (val_get(ctx->val, "option.pidfile", &ov) != VAL_OK)
            || (ov->ndata != 1)
            || (ov->data.s == NULL)
              ) throw(0,0,0);
        log1(ctx, TRACE, "--pidfile = \"%s\"", ov->data.s);

        ctx->option_pidfile = ov->data.s;
    }
    catch (ex)
        rethrow;

    /* --acl MULTI */
    try {
        char *cp;
        int i;

        if (   (val_get(ctx->val, "option.acl", &ov) != VAL_OK)
            || ((ov->ndata >= 1) && (ov->data.m == NULL))
              ) throw(0,0,0);
        log1(ctx, DEBUG, "ov->ndata = %d", ov->ndata);
        for (i = 0; i < ov->ndata; i++)
            log2(ctx, TRACE, "--acl[%d] = \"%s\"", i, (ov->data.m)[i]);

        if ((ctx->pacl = (struct acl *)malloc(ov->ndata * sizeof(struct acl))) == NULL) throw(0,0,0);
        for (i = 0; i < ov->ndata; i++) {
            cp = (ov->data.m)[i];
            log2(ctx, DEBUG, "cp = (data.m)[%d] = \"%s\"", i, cp);
            if (cp[0] == '!') {
                ctx->pacl[i].acl = strdup(cp + 1);
                ctx->pacl[i].not = TRUE;
            }
            else {
                ctx->pacl[i].acl = strdup(cp);
                ctx->pacl[i].not = TRUE;
            }
            log2(ctx, DEBUG, "ctx->pacl[%d].not = %s", i, ctx->pacl[i].not == TRUE ? "TRUE" : "FALSE");
            log2(ctx, DEBUG, "ctx->pacl[%d].acl = %s", i, ctx->pacl[i].acl);
            if ((cp = strrchr(ctx->pacl[i].acl, '/')) != NULL)
                *cp++ = NUL;
            else
                cp = "-1";
            ctx->pacl[i].prefixlen = atoi(cp);
            log2(ctx, DEBUG, "ctx->pacl[%d].prefixlen = %d", i, ctx->pacl[i].prefixlen);
            if ((rc = sa_addr_create(&(ctx->pacl[i].saa))) != SA_OK) {
                log1(ctx, ERROR, "option --acl, create address (internal) failed with \"%s\"",
                     sa_error(rc));
                throw(0,0,0);
                }
            if ((rc = sa_addr_u2a(ctx->pacl[i].saa, "inet://%s:0", ctx->pacl[i].acl)) != SA_OK) {
                log2(ctx, ERROR, "option --acl, parsing address (%s) failed with \"%s\"",
                     ctx->pacl[i].acl, sa_error(rc));
                throw(0,0,0);
                }
        }
        ctx->nacl = i;
    }
    catch (ex)
        rethrow;

    /* --bind SINGLE */
    try {
        if (   (val_get(ctx->val, "option.bind", &ov) != VAL_OK)
            || (ov->ndata != 1)
            || (ov->data.s == NULL)
              ) throw(0,0,0);
        log1(ctx, TRACE, "--bind = \"%s\"", ov->data.s);

        /* dash means stdio */
        if (strcmp(ov->data.s, "-") != 0) { //FIXME does this work with popt()?
            if ((rc = sa_create(&ctx->saServerbind)) != SA_OK) {
                log1(ctx, ERROR, "option --bind, creating TCP socket (internal) failed with \"%s\"",
                     sa_error(rc));
                throw(0,0,0);
            }
            if ((rc = sa_addr_create(&ctx->saaServerbind)) != SA_OK) {
                log1(ctx, ERROR, "option --bind, create address (internal) failed with \"%s\"",
                     sa_error(rc));
                throw(0,0,0);
            }
        /* slash means UNIX socket */
            if (ov->data.s[0] == '/') {
                char *cpPath;
                char *cpPerm;
                int nPerm;
                int n;
                int i;

                cpPath = strdup(optarg);
                cpPerm = NULL;
                nPerm  = -1;
                if ((cpPerm = strrchr(cpPath, ':')) != NULL) {
                    *cpPerm++ = '\0';
                    nPerm = 0;
                    for (i = 0; i < 4 && cpPerm[i] != '\0'; i++) {
                        if (!isdigit((int)cpPerm[i])) {
                            nPerm = -1;
                            break;
                        }
                        n = cpPerm[i] - '0';
                        if (n > 7) {
                            nPerm = -1;
                            break;
                        }
                        nPerm = ((nPerm << 3) | n);
                    }
                    if (nPerm == -1 || cpPerm[i] != '\0') {
                        log1(ctx, ERROR, "option --bind, invalid permissions \"%s\"",
                             cpPerm);
                        throw(0,0,0);
                    }
                }
                if ((rc = sa_addr_u2a(ctx->saaServerbind, "unix:%s", cpPath)) != SA_OK) {
                    log2(ctx, ERROR, "option --bind, parsing alternate IO guessing UNIX socket (%s) failed with \"%s\"",
                         cpPath, sa_error(rc));
                    throw(0,0,0);
                }
                if ((rc = sa_bind(ctx->saServerbind, ctx->saaServerbind)) != SA_OK) {
                    log2(ctx, ERROR, "option --bind, bind (%s) failed with \"%s\"",
                         cpPath, sa_error(rc));
                    throw(0,0,0);
                }
                if (nPerm != -1) {
                    if (chmod(cpPath, nPerm) == -1) {
                        log3(ctx, ERROR, "option --bind, chmod (%s, 0%o) failed with \"%s\"",
                             cpPath, nPerm, strerror(errno));
                        throw(0,0,0);
                    }
                }
                if (getuid() == 0 && getuid() != ctx->option_uid) {
                    if (chown(cpPath, ctx->option_uid, -1) == -1) {
                        log3(ctx, ERROR, "option --bind, chown (%s, %d) failed with \"%s\"",
                             cpPath, ctx->option_uid, strerror(errno));
                        throw(0,0,0);
                    }
                }
                free(cpPath);
            }
        /* otherwise assume INET socket */
            else {
                if ((rc = sa_addr_u2a(ctx->saaServerbind, "inet://%s", ov->data.s)) != SA_OK) {
                    log2(ctx, ERROR, "option --bind, parsing alternate IO guessing INET socket (%s) failed with \"%s\"",
                         ov->data.s, sa_error(rc));
                    throw(0,0,0);
                }
                if ((rc = sa_bind(ctx->saServerbind, ctx->saaServerbind)) != SA_OK) {
                    log2(ctx, ERROR, "option --bind, bind (%s) failed with \"%s\"",
                         ov->data.s, sa_error(rc));
                    throw(0,0,0);
                }
            }
        /* for either sockets */
            if ((rc = sa_listen(ctx->saServerbind, -1)) != SA_OK) {
                    log2(ctx, ERROR, "option --bind, listen (%s) failed with \"%s\"",
                         ov->data.s, sa_error(rc));
                    throw(0,0,0);
            }
        }
    }
    catch (ex)
        rethrow;

CUS:
    return;
}